Pump.



PATENTED JAN. 2a, 1908. L. K. DOELLING.

PUMP

APPLICATION FILED APB.17.1907.

4 SHBETSSHEET 1.

' v Invehior:

Jam/ aw I flii y.

4 SHEETS-SHEET 2.

' fave it 1301".-

PATENTED JAN. 28, 1908.

PUMP.

APPLIIOATION FILED APB..17,1907.

L. K. DOELLING.

ham

l l i PATENTED JAN. 28, 1908.

' L. K. DOELLING.

PUMP.

APPLIOATIOL' FILED APB..17.1907.

4 SHEETS-SHEET 3.

Inventor.

[Kline 52966; W,

LOUIS'K. DOELLING, OF

NEWROGHELLE, NEW YORK, ASSIGNOR fro DE. LA VERGNE MacnINE COMPANY, A CORPORATIONOF NEW YORK.

T all whom it mag concern:

Be it known that I, LOUIS K. DOELLING, a subject of the Emperor of Germany, residing at New Rochelle, in the county of West-.

chester and State of New York, have invented a certain new and useful Improvement in Pumps, of which the following is a specification, -reference being had therein to t e accompanying drawings, forming a part thereof.

My invention relates generally to pumps and more particularly to what are known as variable delivery pumps, and has forits general objects simplicity of construction and efficiency of operation."

A articular object is the more efiicient and SImp ternal combustion engines.

My invention includes the provision of improved means for causing delivery to take place only during a predetermined portion of a com lete cycle of operations of the pump. This not only permits a variation at will of-the amount or quantity of delivery,

but alsov permits of the delivery being so' timed as to take place only within a desired fractional portion of a complete'cycle of'o erations of the pump. Such a result wou d be of utility for various purposes, one of which is the regulation of gas-engines both by properly timing the fuel delivery and by varying the quantity of fuel supplied to the engine.

My invention also includes the provision of means for varying theefit'ective travel of a pump-piston while the actual travel of the piston remains the same. i It is 'in'many instances desirable to vary at will the delivery of a pum in each cycle without altering the extent 0 travel 'of' the pump piston, such extent of travel being the length of stroke in a reciprocating pump and thecircumferential path of the rotary piston in a rotary pump. An example of such 'advantagein the case of reciprocating pumps would be in a gas-engine having the piston-rod ofthe fuelgas pum extended and forming also a iston-r0 for an air-supply um'p, it being esired to vary the delivery 0 the gas-pump without interfering with the operation of the air-pump. For a reciprocating pump the effective piston travel is substantially e uivalent to the effective cylinder length.[ n a reciprocating pump, according to my invention, slots or regulating ports are pro- Specification of Letters Patent. kpplioetionfiled hpril17. 1907. semi No. 368.614.

fied regulation of certain types of in- "engine until some time after t air thereto has commenced.

Patented Jan, 28, 1908.

vided in the pump-cylinder, arranged successively'longitudinally of such cylinder in' the path of the delivery end of the piston and so .as to be successively covered or closed by the advancin piston, such regulatin -ports bein contro ed by a regulating-Va ve by whic they may be opened and closed in the proper succession to roduce the desired result of varying the e ective cylinder length. -My invention also includes the arrange ment of the slots or regulating-ports in a plurality of rows with the ports of one row V opposite the closed spaces or bridges of another row so as to efiect a continuous regulation or a regulation but slightly/intermittent or variable. a i;

My invention also includes the provisionof means for rendering the maximum efiective piston travel of a pump permanently less than the total actual plston travel, "thus permanently reducing what would otherwise e the full delivery of the pump or timing the deliver to a portion of the cycle of operations o the pump; corresponding to or having a certain relation with some other part, or eflecting both of-these results. exam le of the latter purpose or function woul be in the case of a gas engine such as above mentioned in which the fuel-gas pum and the air-su ply pumphave a piston-r03 in common, it being desirable to time the delivery of gas and air relatively to each other so that fuel-gas will not be supplied t i 'th? e supp y 0 My invention further includes the provision of governor-controlled means for varying the effective travel of a pump piston while the actual travel of the iston remains the same, therebyjiutomatically varying the delivery of the pump. Means embodying thisfeature ofv my invention comprise a governor operatively connected to the regulating-valve. Y Y My invention also includes various improvements in the construction and com-- ination of parts, and has other objects and advantageous features, as appearv from the following description. I will now particularly describe the /embodiments of my invention illustrated in the accompanying drawings and will thereafter point out my invention 1n cla ms.

Figure he a lan view of a Koerting gas- 1 engine equippe with .a gas-pump em ody- I pump cylinder showing the unloadingport by the regulating valve. Fig. 7 is a similar I livery represents only a ortion of the entire gas-engine, illustrated to the extent neces- I As the gas-pump is double-acting, to correthe cal section of the ports and valves on a plane my improved pump, as employed, under ing my present invention, with parts of the engine broken away. Fig. 1 is an inverted sectional plan-of the upper half of the gasand the re ulating ports. Fig. 2 is a side elevation 0% the same, with the gasu'mp in section, the plane of section as to t e ports thereof being indicated by the line 22, Fig. 1. Fig. 3. isa central vertical transverse section of thegas-pump. Fig. 4 is an enlarged elevation of the upper portion of the gasump, and adjacent parts, section on iine 44, Fig. 5. Fig. 5 is an enlarged plan View of the same insection on the line 5-5, Fi .4. Fig. 6 is a sectional elevation of a mor lification showing a single-acting reciprocating pump, with all ports controlled new of another modification showing a single acting pump in which the maximum destroke of the piston. ig. 8 is a sectional elevation of a modified double-acting piim in which regulation may be had from ful delivery to any fractional portion thereof. The plane of section of the parts is in rear of the center, as indicated by the line 88, Fig. 9. Fig. 9 is an inverted sectional plan of the upper half of the cylinder of Fig. 8, showing the regulating ports therein. Fi 10 is ahorizontal sectional detail of one o the cages for the regulating-valves. Fig.11 is a vertiforward of the center as indicated by the line '11-11, Fig. 9;

In the embodiment of my invention illustrated in Figs. 1 to 5 inclusive I have shown governor control, to deliver a variable quantity of fuel gas to a gas-engine, according to the demands or, needs of the engine. The

s..ry, is a double-acting two-cycle gas engine of the well known Koerting t e.

Within the gas-pump cylinder 11 is a piston 12 having a piston rod 13 to which is pivotally connected, at a slide or cross-head; 14, a connecting-rod 15 which is also pivoted ch a crank pin 16 carried by a crank-disk 17 on the main shaft 18 of the engine, this main shaft having bearings as shown on the frame or base 19. The crank-disk 17 is, as usual, pro erly timed upon the shaft 18 in relation. to t e engine-crank 20 so that the gas-pump will deliver its charges to the working cylinder or engine-cylinder 21 at proper times in the cycles of operation of the engine.

spond with the'engi-ne, its cylinder 11 has inlet ports or suction-ports 22 at each end thereof. These inlet-ports 22 communicate with passages 23 formed by valve-plates 24 having ports therethrough controlled by usual inwardly-opening inlet-valves or suction-valves 25, the valve plates-24 being.

supported as shown in a valve-chest or 1n conduit or induction-pipe 27 which may from any suitable source of gas supply. The gas purn discharges or delivers the gas through elivery ports in its cylinder-heads 28, such ports being controlled'by usual 'outwardly opening outlet-valves or deliveryvalves 29. As these outlet-valves 29 and the inlet-valves 25 are of usual construction they are shown only diagrammatically in Fig. 2, but two of the former may be seen on a larger scale in Fig. 4, and all are of similar construction. Delivery takes place from the crank end of the gas-pump cylinder into et-chamber 26 into which opens a supplyead an annular space 30, and dehvery takes space 31.

connected in series the gas-carrying conduits or pipes 36 and 37 leading to the head end of the working cylinder 21.

The engine has a usual air-supplying pumg having an air-cylinder 38 from whichlea air-carrying conduits 39 and .40. The iston-rod 13 of the gas-pump is extende to form' a tail-rod 41 formlng a piston-rod for the air-sump cylinder 38. 1 It is esirable and, as is well known, is the practice in engines \of this type to time the delivery of .air and gas to the working cylinseparate the products of combustion fr m the succeeding combustible mixture, and later the combustible mixture of. gas and air is su lied. The means for thus delaying the. delivery of the fuel-gas comprise in the present invention means for causing delivcry of gas from the gas-pump'to take place only during the later portion of travel of the gas-pump piston, and this result is attained by a shortening of the maximum effective length of the gas-pump cylinder as compared to the length of the-stroke of its piston, such maximum effective cylinder ength being less thanthe length of piston stroke, and thus the effective piston travel is rendered less than the total actual piston travel. Themeans for shortening the maxi-- mum effective length of the gasump cylinder include a medial slot or un oading-port 42 therein. This slot 42 o ens into a chamlier or valve-chest 43 whic. in tun! commu= nicates by a passage-way 44 with the inletchamber ,26 (see Fig. 3). This medial communication of the cylinder 11 with the inletchamber 26, as is apparent from the draw-r ings, is permanent, as the slot is alwaysopen. It is evident that under no circumstances can der so that air only is at first supplied, to

rangled for one end or half of the cylinder 11 of t successive clrcumferentia The ports 47 and 49 at their points of 0 entraveled through about forty to fifty per cent. of its complete stroke, which would revariations in its load, governor-controlled and 46 are arranged in two rows,--with the 'slots of one row op osite the closed spacesor The slots communicate respectively with end ofthe cylinder 11, outwardly from the delivery of gas under pressure throughjhe outlet-valves 29 take place until after the slot 42 has been covered by'the iston 12. As shown in the drawin s such s ot would not be thus covered until the piston 12 has sult in a maximum delivery of substantially between fifty and sixty per cent. of what without such communication would be they total delivery capacity of the pump, and itshould be noted that delivery takes place only during the later portion of the stroke of the gas-pum piston 12. The maximum effective cylin er length is determined by the width of the medial slot. As the medial slot extends equally towards opposite ends of the cylinder themaxiinum delivery displacement of the piston 12 will be the same 1n either direction of its movement.

I For regulating the engine toagree with means are lprovided for varying the effective travel of t e fuel-pump piston 12 .while the actual travel of such piston remains the same. This effect or result is brought about by varying the effective length of the cylinder 11 of t e gas-pump. Themeans for thus varying the effective cylinder length include regulating slots or re ulatinge orts extending transversely of t e cylin er 11 and in rows parallel with its axis. Slots 45 are are double-acting pump and similar slots 46 are similarly but oppositely arranged for the other half or end of such cylinder. The slots 45 are disposed successively from a. point adjacent to the medial slot 42 towards the head end of the cylinder, and the slots 46 are likewise successively disposed from a point adjacent to the medial slot 42 towards the crank end of the cylinder. Theslots 45 bridgesbetween' t e slots of the other row, as particularly shown in Fig. 1*, so that the regulation may be continuous and not interrupted by the bridges between the slots.

ports or-passages 47 which open circumferentially into a cylindrical housing or valvecage 48 at respective successive circumferential points thereof. The slots 46. communicate respectively with ports'or passages 49 which open circumferentlally into acylin-' drical housing'or valve-ca e 50 at res ective points t ereof.

ing into the respective housings 48 an 50 are elongated axially of the housin s into comparatively narrow slots, as may e seen. 111 F1g. 5. The housings 48 and '50 alsohave wlder slots or openin s 51: and 52 communicating with the chain er 43. Thus the head vis fixed at its other en the clearance would be small as shown 7' medial slot 42, has communication, through slots 45, ports 47 valve-cage 48, chamber 43 and passage 44, with the lnlet-chamber 26; and ikewise the crank end of the cylinder,

for a space correspondingto theslots 46', has

a like communication with the suction-chamber 26. The ports or passa es 47 are controlled by a partially rotatab e-substantially semi-cylindrlcal regulatingfvalve 53, and the orts or passages 49 are controlled by a simi ar but oppositely arrangedregulating-valve 54. The regulating-valve 53 is supported and pivoted on a pivotin 55 at one end and shaft 56 supported in a bearing 57; and the on a valve-rocking regulating-valve '54-is similarly mounted on a pivot-pin 58 and valve-rocking shaft 59 having a bearing 60.

The valves 53 and 54 are rotatable to cover a greater or lesser number of the ports 47 and 49 respectively. When these orts are all covered the effective length oi the cylinder 11 will be measured'each way from the medial slot 42, that is, the result will be the same as if the slots 45 and 46 did not exist. As the ports 47 and 49 are progressively uncovered, thus opening communication between the chamber 43 and cylinder 11 through successive slots 45 and 46 successively from the middle towards the ends.

of thecylinder, the effective length of the cylinder will be correspondingly shortened,

until, when all of such ports have been'uncovered, .the cylinder will'then be reduced to a minimum effective length equal to the to the limit of ,travel of the piston 12 atthe corresponding end of the cylinder, and, as

in the drawings, such minimum effective length would be'substantially from theoutermost slots 45 and 46 respectively to the correspending cylinder heads 28.

Asthe/slots 45, ports 47, valve-cage 48 and .regulating-valve 53 are laterally oppositely arranged or disposed as compared with" the slots 46, ports 49, valve-cage 50 and regulating valve 54, to correspond to the opposite ends of the cylinder 11, it is evident that the valves 53 and 54 must be rotated in opposite directions to effect a correspondin regulation at opposite ends of )the cylin er. simultaneously and concurrently, the valves 53 and 54 are connected or coupled together to rotate together in opposite directions by a To effect this regulation cross-connecting link 6l'pivoted to substantially oppositely extending cranks 62 and 63 fixed respectively on the valve-rocking shafts 56 and 59. may be thus rocked byan operating-rod 64 shown as also pivoted to the drank-arm 63.

To effect the desired automatic regulation it is obvious that it is only necessary to connect t9 the operating-rod 64 any preferred form The regulating-valves 53 and-54 10o distance from the outermost slot 45 or 46 crank lever 65 pivota tionary arm or bracket extending from and of automatic or speed-influenced governor, and I have accordmgly shown a centrifugal governor as operatively connected to the operating-rod 64.

The governor connections to the regulating-valve operatin -rod 64 include a belllly supported on'a staforming a part of a governor frame or base 67, one arm of the bell-crank .lever being pivoted to the operating-rod 64 and the other arm thereof being pivoted to a substantially vertical link 68 connected to a governor lever 69. The governor is shown as driven from the-main engine-shaft 18 in usual man- .ner. The governor connections are such that an increaseof engine speed above normal raises thegovernor lever'69 andthus,

as will be apparent from the above descrip'-' tion, increases the extent of the opening for the return of the fuel-gas to the su ply-conduit and correspondingly reduces t e supply of fuel-gas to the engine. On the other hand, should the engine speed drop below normal the governor will depress its lever 69 and thus actuate the regulating-valves 53 and.

54 to diminish the opening for the return of fuel-gas to the supply-conduit so that the gas-pump will then delivera greater quantion 'wil tity of fuel-gas to the engine. With the two rows of offset regulating-slots, as shown and above described, each movement of the regulating valves will cause a chan e of the amount of opening between the cy inder and the sup ly-condult, and a'very even regulal be attained. In the modified construction shown in Fig.

' 6- the invention is shown as appliedto a sin gle-acting (pump which may be em loved for purpose, as, for examp e, a single any deslre A cylinder 70 has a piston 71 acting blower.

which may be reciprocated by a piston-rod 72.. The cylinderis provided with an inletvalve or supply-valve 73 controlling. communication with a supply-conduit or intakepipe 74 and is provided with an outlet-valve ordelivery-valve 75 controlling communicavalve-cage or housing 79.

cage 79,'and return-pi e 81, 1S controlled bya partially rotatable rictionally cylindrical regulating-valve 82 in control of the ports- 78 111 the {same manner as in the o erati on of the constructlonfirst-above described. The

regulating-valve 8.2 is controllable by'an 0 I crating-lever 83 secured. on a shaft 84 on which is fixed the valve 82. If all of the ports 7.8 are coveredby the valve 82 then the cylinder will make delivery up to the full capacity of the stroke -of-the piston 71.

If the valve 82 should be rocked so that all of the ports 78 are uncovered then the effective length of the cylinder will be reduced to the minimum and can be no more than that ortion of the-cylinder extendingl'rom its Bottom or head to the .first adjacent slot 77. Intermediate effective cylinder lengths are secured by intermediate positions ofthe regulating-valve 82. In the drawings thefirst slot 77 at the outer or open end of the cylinder is shown as having communication with the supply-conduit 74; therefore, in this instance, delivery into the discharge-conduit '76- Would not begin until after the piston 71 has assed such slot, the piston beingshown in t' e drawings as at the outer limit of its stroke.

When in single-acting pumps it is desired that the maximum deliverv shall ,represent only a portion of the complete stroke of the iston the modified construction shown in .ig. 7 may be employed. In the-construction there shown a pum -cylinder 85 has a piston-86 reciprocatable y a piston-rod 87,

and is provided with an inlet-valve 88 and outlet-valve 89 controlling communication respectively with a supply-conduit 90 and discharge-conduit 91, direction of flow being indicated by arrows. 'llhe cylinder 85 'is provided longitudinally thereof with one row of three regulating-slots 92 communicating respectively with passages 93 opening successlvely circumferentially into a valve-cage or housing'94. The valve-cage 94 also communicates with a return-passage or overflow-' duct 96 which communicates with the supply-conduit 90. The'ports 93 are controlla- 1e by a partially rotatable fractionally' cylindrical regulating-valve 97. To effect regulationthe regulating'walve may be circumferentially shifted byan operating lever 98' fixed onashaft 99. which carries the valve. The construction and o eration as so far described are substantial y the same as were described in reference to Fig. 6 In the construction shown in Fig. 7, to-effect a maximum delivery which will correspond to only aportion of the complete stroke, the'cylin- 1 der 85,- outwardly from the slots 92, has a permanent communication with the supplyconduit 90, this --c ommunication being effected through a slot 100 opening into .a passageway 101. which connects Withthe return-. In the drawings the piston 86 is shown at its outward limit of movement/and it is evident that under no circumstances can.

passage 96.

deliv eryfrom the cylinder 85 take place into the discharge-conduit 91- until after the pis- 'ton has covered the slot 100, after which the point at which delivery will begin will be a..-

invention as a plied to a double-acting pump in-which regu ation may be had from full derelatively to the cylinder.

livery to any desired percentage of full delivery. A cylinder 102 has therein a piston 103. The cylinder is closed at both ends as shown and each head thereof is provided with an inlet-valve 104 and with an outletvalve 105. The piston is carried by a pistoni'od 106 which passes out of the cylinder. at both ends thereof through ordinary packingglands 107. The inlet-valves 104 control communication of the cylinder with supplyconduits 108, and the outlet-valves'105'control communication ofthe cylinder with discharge-conduits 109, the direction of flow being indicated by arrows. In this construction the thickness of the piston 103 is about equal to the len th of its stroke. Two rows of re lating-s ots 110 are provided longitudina ly throughout the length of the cylinder 102, the slots in the two rows being ofi'set or alternated with each other and being ofsuch a width as to be contiguous longitudinally of the cylinder, as may be seen in Fig. 9, the construction in this respect resembling that shown in the principal views of the drawings. At each s1de of a medial point longitudinally of the cylinder the regulating-slots 100 communicate with regulating-ports or passages 111 opening circumferentially into-a cylindrical valve-cage 112. As shown in the drawings there are eight regulating-slots in one of the rows and seven regulating-slots in the other row. This arrangement of an odd number of slots in one row and an even number in the other is preferable in the resentconstruction, as it results in one oi the slots bein a medial slot T 's medial regulating-slot, as may be seen in Fig. 11, has communication through twin ports 111- with both of the valve-cages 112, and thus serves for regulating purposes for both longitudinal halves of the cylinder in both directions of .movement of the piston. The orts for the two rows of slots are arrange in circumferential rows side by' side axially of the valve-cages 112 as may be seen in Fig. 10,

and the valve-cages 112 also have a permanently open communication with the su pl yconduits 108. Fractionally cylindrica partially, rotatable regulating-valves'114 are located respectively in the valve-cages 112 To effect a like re lationin the longitudinal halves of the c 'nder the regulating-valves 114 are coup ed together to rotate in 10 posite 'directions by a cross-connecting lin 115 pivoted to substantiall oppositely extending cranks 116 and 117 e on respective shafts 118 carryin the respective regulating-valves 114. '1 ere lating-valves maybe actuated by an operat ng-rod 119 shown as pivoted to the crank 117.

It is obvious that various modifications may be made in the constructions shown and above particularl described within the prin-. ciple and scope o my invention.

1 claim:

1. A pump comprising a cylinder, a piston therein, the cylinder having a regulatingport located in the path of the delivery end of the piston so as to be closed by the ad vancing piston at an intermediate point of piston travel, and a regulatin .valvein control of the regulating-port, w erebythe effective portion of thet'ravel of the piston maybe varied to vary the delivery of the pump. I p

' 2. A pump comprising a cylinder, a iston. therein, the cylinder having a plura 1ty of regulatingsports located at successively different points in the path of the delivery end of the piston so as to be successively closed by the advancing iston, and regulating means in control of t e regulating-ports an arranged to successively 0 en the regulatingports in the order of the direction of the deivery movement of the piston and to successively close the regulatingorts in the reverse order, whereby the de ivery of the pump may be varied by successive degrees etween minimum and maximum.

3. A pump comprising a cylinder, a iston therein, the cylinder having1 a regu atingport located in the path of t e delivery end of the piston so as to be closed by the advancing piston at any intermediate point of piston travel, a regulating-valve in control of the regulatin -port, and an automatic governor in contro of the regulating-valve.

. 4. A pump comprising a cylinder, a iston therein, the cylinder having a plura ity of regulatin -ports located at successively different points in the ath of the piston so as to be successively c osed .by' the advancing piston, regulating means in control of the regulating-ports and actuatable to successively 0 en the regulating-ports in the order of the elivery movement of the iston and to close the regulation-ports in t .e reverse order, andan automatic governor in control of the regulating means.

5. A pump comprising a cylinder, a piston therein, the cylinder having a plurality of regulating-ports located at successively different points in the path of the piston and arranged to be successivel closed by the advancing iston, and regu ating means in control of t e regulating-ports and actuatable to open the re ulating-ports successively in the order of the direction of the delivery 'ulatin ports successively in the reverse or.-

der, W ereby the delivery of the pump may -be varied by successive degrees between minimum and maximum, the cylinder also, having an unloading-port arranged so as to be closed by the piston in advance "of the regulating-port, whereby the maximum delivery I of the pump re resents but a portion of the total travel of the piston.

6. A pump comprising a cylinder, a iston therein, the cylinder having a lurallty of regulating-ports at successive y different points in thepath of the delivery end of the piston, the regulating-ports being arranged 1n a plurality of rows with ports of one row opposite the closed spaces of another row, and regulating means in control of the regulating-portsand actuatable toopen the regulating-ports successively in the orderof the tion of the delivery movement'ofthe piston and to close the regulating-ports successively in the reverse order, and an automatic governor in control of the regulating means.

8. A pump-comprising a cylinder, a iston therein, the cylinder having a lura ity of regulating ports at successive y difierent points in the path of the delivery end of the piston, the regulating-ports being arranged in a plurality of rows with ports of one row opposite the closed spaces of another row, t e cylinder'also having an unloading-port arranged so as to be closed by the iston in advance of'the regulating ports, anr regulating means in control of the regulating-ports and actuatable to open the, regulating-ports successively in the order of the direction of the delivery movement of the-piston and to close the regulating-ports successively in the reverse order. v

9. A double-acting ump comprising a cylinder, a reciprocatab e piston therein, the cylinder in each lon itudinal half thereof having a plurality 0 regulating-ports arranged at successively different points inthe path of the piston so as to be successively mg means in control 0 closed by the advancin gliston, and regulatt e regulating-ports and actuatable to 0 en the regulating ports for each longitudina half of thecylinder succylinder, a reciprocatable cessively from the middle of the cylinder toward the ends thereof and to close the-regu lating-ports for each longitudinal half of the cylinder successively in the reverse order, v p I 1 whereby re ulation of delivery may beyfect ed in both directions of piston movem 10. A double-acting pump comprising a cylinder in each longitu inal half thereof having a plurality of regulating-ports arranged at successively different pointsin the path of the piston, the regulatin -ports for each cylinder half being arrange in a plurality of rows with the orts 'of one row opposite the closed spaces of another row, so as to be successive] closed by the advancing piston, and regu ating means in control of the regulatin -ports for each longitudina half of the cylin er successively from the middle of cylinder, a reciprocatable iston therein, the

-regulating-ports and actuatable to 0 en thethe cylinder toward the ends thereof and .to

close the regulating-ports for each longitudinal half of the cylinder successively in the reverse order. v i

11. A double-acting pump comprisingra cylinder, a reciprocatable iston therein, the cylinder in 'each longitu inal half thereof havin a plurality ofv regulating-ports arrange at successively different points in the path of the piston so as to be successively closed by the advancing piston, the cylinder also having an unloadingort located between the regulatin orts elonging to the opposite longitudinall lialves of the cylinder, and regulating means in control of the regulating-ports and actuatable to open the regulating-ports for each longitudinal half of the cylinder successively from the middle of the cylinder toward the ends thereof'and to close t e regulating-ports. for each longitudinal half of the cylinder successively in the reverse order. i

12. A double-acting pump comprising a cylinder, a reciprocatable iston therein, the cylinder in each longitudinal half thereof havin a plurality of regulating-ports arrange at successively different points in the path ofthe piston, the regulating-ports for each cylinder half being arranged in apluralityofrows with the ports of one row 0pposite the closed spaces of-another row, so-a's to be successivel closed by the advancing piston, the cylin er also having an unloadmg-port located between the regulatingports-belonging to the op osite longitudinal alves of the cylinder, an regulating-means in control of the regulating-ports and actuatable to open the regulating-ports for each longitudinal half of the cylinder successivelyfrom the middle of the cylinder toward the ends thereof and to close the regulatingports for each longitudinalhalf of the cylinder successivel in the reverse order,

.13. A doub e-acting pump comprising a iston thereof, the. cylinder in each longitu inal half, thereof havin a plurality of-regulating-ports arrange at successively different pointsin the lating-ports for each longitudinal half of the cylinder successively in the reverse order,-

and an automatic governor in control of the regulating means.

14. A double-acting pump comprising a cylinder, a reciprocatable piston therein, the cylinder in each longitudinal half thereof havinga plurality of regulating-ports arranged at successively different points in the path of the piston, the regulatingeports for each cylinder half being arranged in a plurality of rows with the ports of one row opposite the closed spaces of another row, so as to be successively closed by the advancing piston, regulating means in control of the regulating-ports and actuatable to open the regulating-ports for each longitudinal half of the cylinder successively from the middle of the cylinder toward the ends thereof and to close the regulating-ports for each longitudinal half of the cylindersu'ccessively in the reverse order, and an automaticgovernor in control of the regulating means.

15. A double-acting pump comprising a cylinder, a reciprocatable piston therein, the cylinder in each longitudinal half thereof having a plurality of regulating-ports arranged at successively different points in the longitudinal half of the cylinder successively from the middle of the cylinder toward the ends thereof and to close the regulatingports for each longitudinal half of the cylinder successively in the reverse order, andan automatic governor in control of the regulating means.

16. A double-acting pump comprising a cylinder, a reciprocatable iston therein, the

cylinder in each longitu inal half thereof having a plurality of regulating-ports arranged at successively different points in the path of the piston so as to be successively closed by the advancing piston, the cylinder also having an unloadingort located between the regulatingorts elonging to the opposite longitudinalv alves of the cylinder,

ports and actuatable to open the re ulatingports for each longitudinal half of the cylinder successively from the middle of the cylinder toward the ends thereof and to close the regulating-ports for each longitudinal half of the cylinder successively in the reverse order, and an automatic governor in control of the regulating means.

17. A pump comprising a cylinder, a piston therein, a sup ly-conduit and a closable inlet for the CyllHL er, the cylinder having an unloading-port in the path of the delivery end of the piston and communicating with the sup ly-conduit in advance of the closable inlet, w iereby discharge may be made back into the supply-conduit during a portion of the piston stroke and until the unloadingport has been covered by the piston.

18. A pump comprising a cylinder, apiston therem, a supply-conduit and a closable inlet for the cylinder, the cylinder having a regulating-port in the path of the delivery end of the piston and communicating with the supply-conduit in advance of the closable inlet, and a regulating-valve in control of the regulating-port, whereby, when the regulat ing-port is open, discharge maybe made back into the supply-conduit until the regulating-Kort has been covered'by the piston.

19. ton therein, a supply-conduit and a closable inlet for the cylinder, the cylinder having a plurality of regulating-ports at successively different points in the path of the delivery end of the piston and communicating with the supply conduit in advance of the closable inlet, and regulating means in control of the regulating-ports and actuatable to open the regulating-ports successively in the order of the direction of the delivery movement of the piston and to close the regulating-ports successively in the reverse order.

' 20. A pump comprising a cylinder, a iston therein, a supply-conduit and a closa le pump comprising a cylinder, a pisinlet for the cylinder, the cylinder having a regulating port, in the path of the delivery end of the piston and communicating with the sup ly-conduit in advance of the closable inlet, wliereby discharge may be made back into the supply conduit during a portlon of the piston stroke and until the regulat ng port is covered by the piston, a regulating valve in control of the regulating-port, and

an automatic governor in control of the regu- 4 lating-valve.

21. A pump comprisin a cylinder, a piston therein, a supply-con uit and a closable inlet for the cylinder, the cylinder having a lui'ality ofregulating-ports at successively iflerent points in the path of the delivery end of the piston and communicating wit the supply conduit in advance of the closable inlet, regulating means in control of the reguregulating means in control of the regulatingl latingports and actuatable to open the regulating-ports successively in the order of the.

direction of the delivery movement of the piston and to close the regulating-ports successively in the reverse order, and an automatic governor in Control of the regulating means. 1

22. A ump comprising a cylinder, a piston therein, a supply-conduit and a closable inlet for the cylinder, the cylinder havinga plurality of regulating-ports at successively different points in the path of the delivery end of the piston and communicating with the supply-conduit in advance of the closable inlet, and regulating means-in control of the regulating-ports and aetuatable to open the regulating-ports successively in the order of the direction of the delivery movement of the piston and to close the regulating-ports successively in the reverse order, the cylinder also having an unloading port arranged so as to be closed by the iston in advance of the regulating-ports am permanently communicating with the supply-conduit in advance of the closable inlet.

23. A pump comprising a cylinder, a piston therein, a supply-conduit and a closable inlet for the cylinder, the cylinder having a plurality vof regulating-ports at successively difierent'points in the path of the deliver? t 1 'posite the closed spaces of another row, and

regulati means in control of the regulatingports an actuatable' to open the re ulatingports successively in the order of t e direction of the delivery movement ofv the piston and to close the regulating-ports successively in thereverse order. e

24. A pump comprising a cylinder, a piston therein, a supply-conduit anda closable inlet for the cylinder, the cylinder having a plurality of regulating-ports at successively difierent points in the path of'the delivery end of the piston and communicating with. the supply-conduit in advance of the closable inlet, the regulating-ports being arranged in a plurality of rows with ports of one row opposite the closed spaces of an= other row, regulating means in control of the regulating-ports and actuatable to open the regulating-ports successively in the order of the direction of the delivery movement of the piston and to close the regulating-ports successively in the reverse order, and an automatic governor in control of the regulating means. v

25. A pump comprising a cylinder, a piston therein, a supply-conduit and a closable inlet for the cylinder, the cylinder having a plurality of regulating-ports at successively different points in the path-of the delivery end of the piston and communicating with the supply-conduit in advance of the closable inlet, the regulating-ports being arranged in a plurality of rows with ports of one row opposite the closed spaces of another row, the cylinder also having an unloading-port arranged so as to be closed by the piston in advance of the regulating. pprts and )ermanentlycommunicating with the supply-conduit in advance of the closable inlet, and regulating means in control of the regulating-ports and actuatable to open the regulating-ports successively in the order of the direction of the-delivery movement of the piston and to close the regulating-ports successively in the reverse order.

26. A double-acting pump comprising a cylinder, a reciprocatable piston therein, a supply-conduit and inlet valves for the cylinder, the cylinder in each longitudinal half thereof having a luralityof regulating-ports at successively (ifi'erent points in the path of thepiston and communicating with the srupply-conduit in advance of the inletva ves, and regulating means in control vof the regulating-ports and actuatable to open the regulating-)orts for each longitudinal half of the cylmder successively from the middle of the cylinder toward the ends thereof and to close the regulating-ports for each longitudinal half of the cylinder successively in the reverse order.

27. A double-acting pump comprising a cylinder, a reciprocatable piston therein, a

supply-conduit and inletvalves for the cylinder, and a discharge-conduit for the cylinder, the cylinder having an unloadingport located in the path of the piston so as to be closed and passed by the piston in both directions of piston travel and permanently communicatingwith the supply-conduit in advance of the inlet-valves, whereby in each direction of piston movement discharge takes place back into the supply-conduit until the the supply-conduit in advance of theinlet-' valves. c

29. A double-acting pump comprising a cylinder, a reciprocatable piston therein, a supply-conduit and inlet-valves for the cylinder, the cylinder in each longitudinal half thereof having a plurality of regulating-ports at successively diiierent points in the path I of the piston and communicating with the su ply-conduit in advance of the inletva ves, the regulating ports for each cylinder half being arranged in a plurality of rows with the ports of one row opposite the closed in control of the regulating-ports and actuatable to open the regulating-ports for each longitudinal half of the cylinder successively from the middle of the cylinder toward the ends thereof and to close the regulatingports for each longitudinal half of the cylinder successively in the reverse order.

30. A doubleacting ump comprising a cylinder, a reciprocatab e piston therein, a supply-conduit and inlet-valves for the cylinder, the cylinder in each longitudinal half thereof having a plurality of regulatingports at successively diiferent points in the path of the piston and communicating with the supply-conduit in advance of theinletvalves, the cylinder also having an unloading-port therein located between the regulating-ports belonging to the opposite longitudina halves of the cylinder and permanently communicating with the supply-conduit in advance of the inlet-valves, and regulating means in control of the regulatingports and actuatable to open the regulatingports for each longitudinal half of the cylinder successively from the middle of the cylinder toward the ends thereof and to close the regulating-ports for each longitudinal half of the cylinder successively in the reverse order. v

31. A double-acting pump com rising a cylinder, a reciprocatab e piston t erein, .a supply-conduit and inlet-valves for the cylin er, the cylinder in each, longitudinal half thereof having a at successively different points in the ath of I the piston and communicating with t e supply-conduit in advance of tiie inlet-valves, the regulating-ports for each cylinder half being arranged in a plurality of rows with the ports of one row opposite the closed spaces of another row, the cylinder also having an unloading-port therein located between the regulatingorts belon 'ng to the opposite longitudinal alves of t e cylinder and ermanently communicating with the su p y-conduit in advance of the inletva ves, and regulating means in control of the regulating-ports and actuatableto open the re latingorts for each lon 'tudmal half o 1 the vcylinder successively om the middle of the cylinder toward the ends thereof and to close the regulatin -ports for each lon 'tudinal half of the cylini ler successively in t e reverse order. 4

32. A double-acting ump com rising a cylinder, a re'oiproc-atab e plston t erein, a supply-conduit and inlet-valves for the'cylin er, the cylinder in each longitudinal half thereof having a plurality of regulating-ports at successively different points in the ath of the piston'and commumcating with t e sup-v ply-conduit in advance bf the ,inletrvalves, regulating means in control of the regulatingplurality of regulating-ports half being arranged opposite longitudinal alves v of .t

ports and actuatable to open the regulatingports 101' each longitudinal half of t e cylinder successively from the middle of the cylinder toward the ends thereof and to close the regulatin -ports for each longitudinal half of the cylinder successively in the reverse order, and an automatic governor in control of the regulating means. I

33. A double-acting ump com rising a cylinder, a reciprocatab e piston t erein, a su ply-conduit and'inlet-valves for the cylinder, the cylinder in each longitudinal half thereof having a plurality of regulating-ports at successively different points in the ath of the piston and communicating with t e supply-conduit in advance of the inlet-v alves, the regulating ports for each cylinder half being arranged in a plurality of rows with the ports of one row opposite the closed spaces of another row, regulating means in control of the regulating-ports and actuatable to open the regulating-ports for each longitudinal half of the cylinder successivel from the middle of the cylinder toward the ends thereof and to close the regulatin' -ports for each lon itudinal half of the cylin er successively in t e reverse order, and an automatic governor in control of the regulating means.

34. A double-acting pump com rising a cylinder, a reciprocatab e piston t erein, a supply-conduit and inlet-valves for the cylinder, the cylinder in each longitudinal half thereof having a plurality of regulating-ports at successively dliferent points in the pathof the piston and communicating with t e supply-conduit in advance of the inlet-valves, the cylinder also having an unloading-port therein located between the regulating-ports belonging to the opposite longitudinal halves of the cylinder an permanently communicating with the supply-conduit in advance of the inlet-valves, regulating means in control of the regulating-ports and actuatable to open the regulating-ports for each longitudinal half of the c linder successively from the middle of the cy inder toward the ends thereof and to close the regulating-ports for each ion itudinal half of the cylinder successively ves, the regulating p'orts for each cylinder with the ports of one row opposite the closed spaces of another row, the cylinder also havmg tween the regulatingorts. belon 'ng to the 1n a plurality of rowse cylinder an unloading-port therein located be- 1 and ermanently communicating with the verse order, and an automaticgovernor in 10 supp y-conduit in advance of the inlet valves, control of the regulatin means.

, regulating means in control of the regulating- In testimony whereo I have affixed my ports and actuatable to open the re ulatingsignature in presence of two witnesses.

, ports for each longitudinal half of t e-cylinder successively from the middle of the cyl- DQELLING" inder toward the ends thereof and to close Witnesses: the regulatingorts for each longitudinal HENRY D. WILLiAMs,

half of the cyllnder successively in the re- BERNARD COWEN. 

